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作 者:谢树京 XIE Shujing(University of South China,Hengyang 421001,China)
机构地区:[1]南华大学,湖南衡阳421001
出 处:《现代电子技术》2022年第23期60-65,共6页Modern Electronics Technique
基 金:湖南省教育厅科研项目(19C1598);衡阳市指导性科技计划项目(2020jh012689);南华大学科研启动项目(190XQD002)。
摘 要:认知无线电网络中的从用户通过检测主用户频谱占用情况,与主用户实现频谱共享。为了提高从用户系统频谱检测的精度,减小系统错误概率,利用能量检测算法对单个从用户频谱感知和多个从用户合作频谱感知进行分析,对比了不同场景和合作方式下单个从用户感知与多个从用户合作感知的检测性能,提出一种采用最优检测门限及对应合作方式使系统错误概率最小的感知方法。仿真结果表明,多个从用户合作频谱感知未必一定优于单个从用户频谱感知,考虑主用户频谱空闲概率不同时,在单用户频谱感知系统中该方法得到的风险值最小,在多用户合作频谱感知系统中该方法得到的风险值接近最小值,在“半数”融合的多用户合作频谱感知方式下该方法的系统错误概率达到最小,能更好地实现主从用户频谱共享。In the cognitive radio networks,the slave users share the spectrum with the master users by detecting the spectrum occupation of the master users.In order to improve the accuracy of the spectrum detection of the salve user system and reduce the system error probability,the energy detection algorithm is utilized to analyze the spectrum sensing of a single slave user and the cooperative spectrum sensing of multiple slave users,the spectrum detection performances of a single slave user sensing and cooperative sensing of multiple slave users in different scenarios and cooperation modes are contrasted,and a spectrum sensing method to minimize the system error probability by the optimal detection threshold and corresponding cooperation mode is proposed.The simulation results show that the cooperative spectrum sensing of multiple slave users is not necessarily better than the spectrum sensing of a single slave user:when the spectrum idle probabilities of master users is different,the risk value obtained by this method is the minimum in single⁃user spectrum sensing system,the risk value obtained by this method is close to the minimum in multiple⁃user cooperative spectrum sensing system,and the system error probability of this method is minimized in the multiple⁃user cooperative spectrum sensing mode of″half″fusion,so this method can realize the spectrum sharing between master users and slave users better.
关 键 词:认知无线电网络 频谱感知 能量检测 虚警概率 检测概率 漏检概率 数据融合 错误概率
分 类 号:TN911.6-34[电子电信—通信与信息系统]
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